What is it?

It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays. This allows you to, for example, see what IO ports are being read and written, or what memory addresses are being written.

Why did you make it?

They chose was to add some configurable latching capability. I broke out the M1, MREQ, IOREQ, RD, and WR signals to a jumper so that those signals can be used to trigger the latch on the 74HC573. If you select M1, then in theory you should be able to see every instruction load address. If you select IOREQ then you should be able to see every IO request. Watching instruction loads at 7.3728Mhz is still not something the human eye can perceive, but io requests happen much less frequently and you can actually see stuff happen.

What makes it special?

You have to be careful not to engage two jumpers at the same time . We use a NPN BJT circuit as a NOT function. The product needs to be assembled and soldered by yourself.

BOM List:

PIC16 DIP28 x1 (micro-controller)

TTL 74HC573 DIP20 x3

OLED Module x1

LED x5

BJT BC547 x1 (NPN TO-92)

R 220 ohm x7

Diode 1N4114 x1

CAP 100uF x1

Jumper x1

Pin Header

PCB x1

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About avrtool

I am an electronics hobbyist from New Taipei County,Taiwan.I love playing with microcontrollers and doing interesting things with Audio AMP,Special instrument and MIDI.If you have any idea please tell me.My email is avrtool@gmail.com